Metallic character decreases as you
move across a period in the periodic
table from left to right. This occurs as
atoms more readily accept electrons
to fill a valence shell than lose them
to remove the unfilled shell. Metallic
character increases as you move down
an element group in the periodic table.
This is because electrons become easier
to lose as the atomic radius increases,
where there is less attraction between
the nucleus and the valence electrons
because of the increased distance
between them.
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